A storm with the time distribution shown in the table generates direct runoff of $4\mathrm{.}9cm.$ The time of excess rainfall of the storm is $q,$

$\backslash$table$[[\backslash$table$[[$Time from$],[$start $($h$)]],1,2,3,4,5,6],[\backslash$table$[[$Incremental$],[$rainfall in each$],[$hour $(mm)$